No-global-loop amplification

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maty tinman

maty tinman

Member
Joined 2012
nauscopio.wordpress.com/about/
Just now, in other forum, some music to try with PURIFI 1ET400A:

Ultimate 1ET400A Purifi Amplifier sonic shootout - €820 to €8,344 | Page 3 | Audio Science Review (ASR) Forum


I have too: Eagles - Hell Freezes Over (1994), Vinyl x2, Geffen, 180g, UK

DR Peak RMS Filename
----------------------------------------------------------------------------------------------

DR11 -1.15 dB -14.06 dB 01 Get Over It
DR12 -2.53 dB -16.41 dB 02 Love Will Keep Us Alive
DR11 -1.75 dB -15.05 dB 03 The Girl from Yesterday
DR10 -2.75 dB -15.10 dB 04 Learn to Be Still
DR10 -1.59 dB -14.44 dB 05 Tequila Sunrise
DR13 -1.09 dB -16.61 dB 06 Hotel California
DR12 -0.56 dB -16.56 dB 07 Wasted Time
DR12 -0.63 dB -15.11 dB 08 Pretty Maids All in a Row
DR12 -0.99 dB -15.13 dB 09 I Can't Tell You Why
DR12 -0.56 dB -15.54 dB 10 New York Minute
DR12 -0.30 dB -15.98 dB 11 The Last Resort
DR12 -1.48 dB -14.52 dB 12 Take It Easy
DR11 -0.87 dB -13.84 dB 13 In the City
DR12 -0.66 dB -14.20 dB 14 Life in the Fast Lane
DR11 -1.53 dB -16.63 dB 15 Desperado
----------------------------------------------------------------------------------------------

Number of files: 15
Official DR value: DR12
 
Last edited:
J

jwilhelm

Member
Joined 2014
vzaudio.com/
Simpelstark AX3 is running nicely! Still doing some fine tuning but it's looking good so far.
 

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vzaichenko

vzaichenko

R.I.P.
Joined 2010
Ampi said:
Hi Valery,


the input j-fets 2sk246 and 2sj103 for this amp are not easy to get. Are there alternative j-fets, which can be used and more easy to purchase?
regards Chris
Click to expand...

Hi Chris,

Sorry - I've missed your message somehow.
Unfortunately, this design is based on those jFETs.
I have deliberately designed the next amplifier in this series (AX3) with low-noise BJTs at the input, just to go away fron the hard-to-get jFETs.
Although I love jFETs at the input. It's a pity the choice becomes narrower every year.

Cheers,
Valery
 
vzaichenko

vzaichenko

R.I.P.
Joined 2010
drgnanam said:
Hi cresnet,
How does this amp compare to shaan peeceebeeV4H
Click to expand...

Hi Drgnanam,

You need to hear it in a good system. It's a completely different story.
I don't know why many people under-value no-global-loop / low-global-loop designs. An important advantage of Simpelstark family - accurate phase handling.

Human's hearing system is much more sensitive to phase, than it is to amplitude. Our brain understands direction where the sound comes from, based on the combination of phases, registered by each ear. I think, this is one of the reasons for fantastic soundstage, produced by this amplifier,
and I believe this is a key component of success for many tube-based amplifiers as well.

As Cresnet mentioned, this is something difficult to describe. Very natural sound with "higher than normal" level of instruments separation - that's the best description I can give :)
You know, it's still like describing the taste of an excellent dish in the restaurant :D Unless you try it - any words are not enough, as they don't cover all the nuances of its taste. By the way, some people may still not like it. But for many others it's delicious :checked:

Cheers,
Valery
 
A

Ampi

Member
Joined 2011
vzaichenko said:
Hi Chris,

Sorry - I've missed your message somehow.
Unfortunately, this design is based on those jFETs.
I have deliberately designed the next amplifier in this series (AX3) with low-noise BJTs at the input, just to go away fron the hard-to-get jFETs.
Although I love jFETs at the input. It's a pity the choice becomes narrower every year.

Cheers,
Valery
Click to expand...


Hi Valery,
Good decision, it is better to use easy to get devices for design. So more people are able to build your amps ;).
 
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